Carry over --impure from initial nix run to nixinate evaluation

I have some scripts which require --impure mode to be enabled.

        {
          _module.args.nixinate = {
            host = "host";
            sshUser = "root";
            buildOn = "local";
            substituteOnTarget = false;
            hermetic = false;
            nixOptions = [ "--impure" ];
          };
        }

Option: I would expect that 'nix run .#apps.nixinate.machine' now runs as impure without using the --impure option explicitly :

error:
   … in the left operand of the update (//) operator

     at /nix/store/7gzgi8zsnh06pv9cphb30yv9h1pyn4nk-source/flake.nix:84:20:

       83|                    )
       84|                    // nixpkgs.lib.genAttrs
         |                    ^
       85|                       (map (a: a + "-dry-run") validMachines)

   … while calling the 'listToAttrs' builtin

     at /nix/store/f0ddmw6s86y567yg06h5019z72szbzch-source/lib/attrsets.nix:1248:5:

     1247|     f:
     1248|     listToAttrs (map (n: nameValuePair n (f n)) names);
         |     ^
     1249|

   (stack trace truncated; use '--show-trace' to show the full trace)

   error: access to absolute path '/etc/hostname' is forbidden in pure eval mode (use '--impure' to override)

My script tries to read /etc/hostname therefore we ran into problems here.

Option: However if we decide to run 'nix run .#apps.nixinate.machine --impure' we bypass the error.
Option: Just running 'nix run .#apps.nixinate.machine --impure' without settings the nixOption still fails with the pure eval mode error.

So I guess arguments passed to nix run don't really carry over when nixosConfigurations are evaluated/built atleast. Maybe there is a way to read arguments passed to nix run during evaluation and concat them with the maybe provided nixOptions options?

MatthewCroughan / nixinate

Carry over --impure from initial nix run to nixinate evaluation #54